Chances are they do have some custom firmware on them, Sun seems to enjoy putting custom firmware on everything for whatever reason. But that's beside the point, any standard IDE device will work. Many people have IDE burners inside their IDE sparcs.

Chances are they do have some custom firmware on them, Sun seems to enjoy putting custom firmware on everything for whatever reason. But that's beside the point, any standard IDE device will work. Many people have IDE burners inside their IDE sparcs.